Corrosion Science 173 (2020) 108828
Corrosion Science 173 (2020) 108828 Contents lists available at ScienceDirect Corrosion Science journal homepage: www.elsevier.com/locate/corsci The oxidation effect on the cracking behavior of a Co-based alloy under thermal shocks T Junxia Wena,b,c,d, Rui Caoa,b,*, Hongyan Chee, Hao Donge, Haiyan Zhanga,b, Yingjie Yana,b, Yanfei Gaoc,**, Peter K Liawc,** a State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China b School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China c Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996, USA d School of Mechanical and Electrical Engineering, Liuzhou Vocational & Technical College, Liuzhou 545006, Guangxi, China e Advanced Technology & Materials Limited Company, China Iron & Steel Research Institute Group, Beijing, 100081, China ARTICLE INFO ABSTRACT Keywords: Oxidation and cracking behavior during thermal-shock experiments of a new Co-based alloy were analyzed in Co-based alloy the present work. Comparing to the static conditions, the oxidation behavior during thermal shocks is stress- Thermal shock assisted and crack-accelerated. Cracks during the thermal shocks were initiated from the sample surfaces and Oxidation their growth are driven by various stresses, including those induced by volume change, mismatch of coefficients Crack of thermal expansion (CTEs), and temperature gradient between the matrix and the internal oxides. It is found Thermal fatigue that the crack propagation correlates to these stresses in the classic Paris’ law. 1. Introduction also different from that in the static oxidation. The cyclic oxidation behavior of the Co-based alloy has been well investigated by Barrett The Co-based alloy has a good combination of high-temperature and Lowel [13].
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